Fuel-feeding means for charge-forming devices



March 27, 1928;

A. G. REDMOND FUEL FEEDING MEANS FOR CHARGE FORMING DEVICES Filed Jan 5,1923 2 Sheets-Sheet 1 gwueflto'c nu u z o .r. t a

2 Shete-Sheet 2 C] (To A. G.'REDMOND Filed Jan. 5, 1923 March 27, 1928.

FUEL FEEDING MEANS FOR CHARGE FORMING DEVICES Patented Mar. 27, 1928.

' UNITED STATES PATENT OFFICE.

ALBERT G. REDMOND, or mnmnarous, manna, assrenon raancrs, or FLINT,MICHIGAN.

DO JACOB RIOHAI FUEL-FEEDING MEANS FOR CHARGE-FORMING- DEVICE-i5.

Application filed January 8, 1928. Serial No. 610,470.

This invention relates to certain new and useful improvements in fuelfeeding means for charge forming devices and is an improvement on myapplication filed August 18, 1922, Serial Number 582,574, the objectbeing to provide novel means for operating the pump for raising the fuelfrom the main fuel tank to the bowl of the charge forming device orcarburetor.

Another object of my invention is to provide an air pump operated by theinternal combustion engine and so timed that on every twenty revolutionsof the engine, the piston of the air pump will be operated so as toforce air into a cylinder beneath a piston which is connected to thepump piston in such a manner that the pump piston will be raised andallowed to drop so as to force the fuel to the charge forming device.

A still further object of the invention is to provide a construction offuel feeding means which can be manufactured cheaply and quicklyinstalled on any of the well known types of internal combustion enginesnow in use.

Another and further object of the invention is to provide fuel feedingmeans in which the pump for forcing the fuel to the charge formingdevice is disposed within the 30 main fuel supply tank so as to preventleakage in any way and to provide a construction which can be readilyinstalled in any of the well known types of fuel tanks now in use.

Other and further objects and advantages of the invention will behereinafter set forth and the novel features thereof defined by theappended claims. 1

In the drawings,

Figure 1 is a side elevation of an internal combustion engine showingthe application of my improved construction of fuel feeding meansthereto;

Figure 2 is a detail vertical section of a portion of a crank case ofthe internal combustion engine showing the manner of attaching the airpump and driving the same from the internal combustion engine;

Figure 3 is a detail perspectiiew of the driving means for the air punand Figure 4 is a vertical section through my improved construction offuel pump positioned within the main fuel supply tank.

In the drawings 1 indicates an internal combustion engine, 2 the intakemanifold, 3 the charge forming device and 4 the main fuel supply tankwhich is generally located to the rear of the motor vehicle in which thenternal combustion engine is installed and in a lane below the chargeforming device, the a ov e description being iven so that theapplication of my improve construction of fuel feeding means can bereadily understood.

l )is osed within the fuel tank 4 is a pump cylm er 5 provided with adepending intake pipe 6 and a lateral nipple 7 to which is connected avalve casing 8 provided with a check valve 9. Connected to the Valvecasing 8 is a fuel p1pe.10 which extends upwardly and out through a capplate 11 and has its other end connected to the fuel bowl of the chargeforming device. The lower end of the pump cylinder is provided with acheck valve 12 controlling the intake of fuel and it will be noticedthat the pipe extends down close to the bottom of the fuel tank so thatprac-,

tically all of the fuel in the fuel tank can be consumed.

The pump cylinder 5 carries a pipe 13 which extends through the coverplate 11 of the tank 4 and is provided with an air cylinder 14 at itsend, the top of which is closed by a cover 15 which is provided with avent 16.

Slidably mounted within the air cylinder 14 is a piston 17 carrying apiston rod 18 which is connected to a fuel pumping piston 19 mountedwithin the ump cylinder 5, the downward movement of which is limited bya stop 20. The piston 19 is provided with a vertical bore 21 andconnected to the pump of the cylinder is a pipe 22 which is connected toa valve casing 23 secured to the lower end of an air pump 24, the valvecasing being provided with a spring-held ball check valve 25.

Theair pump 24 is secured to the crank case of the internal combustionengine as clearly shown in Figure 1 and is provided with an inlet valvecasing 26 provided with a spring-pressed ball check valve 27, the valvecasing extending through a suitable opening formed in the crank case asclearly shown in Figure 2 so that the air drawn in by the pump will betaken from the interior of the crank case in order to keep the pumpthoroughly lubricated.

Supported within the cylinder of the air pump 24 by a coil 28 is ahollow piston 29 which is provided with an enlarged head portion 30working in an enlarged upper end of the pump casing, said head beinadapted to be engaged by a cam 31 carri by a shaft 32 provided with aworm wheel 83 which meshes with a worm 34 formed on a revolving shaft 35of the internal combustion engine and may be the cam shaft of theinternal combustion engine or any other revolvin shaft.

By this construction the iston 29 is reciprocated so that air will e.drawn from the interior of the crank case and forced into the cylinder14 so as to raise the main or pumping piston 19. As the piston 17 1Sraised by' the air forced in beneath the same, the fuel pumping pistonis raised and as the air pump is operated preferably every twentyrevolutions of the internal combustionengine, the pumping piston will beraised every twenty revolutions and allowed to drop by its own weight asthe air bypasses the piston 17 through the passage 23 so as to allow thepiston of the main fuel pump to drop by gravity to displace the fuelwithin the pump cylinder so as to force it through the pipe 10 into thebowl of the charge forming device.

The weight of the piston is determined by the pressure exerted ontheneedle valve by the float in the fuel bowl of the charge formingdevice so that fuel is maintained in the pipe line under pressure at alltimes to enable the fuel to flow instantaneously into the bowl of thecharge forming device when the fuel therein drops below a predeterminedlevel.

lVhen the air is forced by the air pump driven by the internalcombustion engine and timed thereby into the cylinder 14 disposed uponthe main fuel supply tank, the fuel pumping piston is raised and allowedto drop by its own Weight and as the pump cylinder is provided withcheck valves, the fuel is drawn into the pump cylinder and forcedoutwardly by the piston, the stroke of the piston being determined ldythe consumption of fuel by the internal combustion engine as the pistonis held by the pressure of the fluid within the cylinder in differentpositions so that the stroke of the piston; is determined by theconsumption of fue I .am aware that instead of relying on the weight ofthe piston to force the fuel from the pump cylinder to the chargeforming device a calibrated spring could be placed above the piston sothat after being raised, the spring would exert the desired pressure tomaintain the fuel under pressure at all times and therefore I do notwish to limit myself to the use of a piston having a predeterminedweight for obtaining the desired result.

What I claim is 1. The; combination with an internal combustion enginehaving a charge forming device and a main fuel supply located in a planebelow said charge forming device of a. pump disposed in said fuel supplytan a pipe leading from said pum to the charge forming device, said pumpaving a reci rocating piston, an air pump driven by t e internalcombustion engine, an air cylinder provided with a piston disposed abovethe fuel pump and having a connection with the piston thereof and meansfor delivering air to said air cylinder below said piston forintermittently raising said pump piston to allow said pump piston todrop by gravity for maintaining fuel in the fuel pipe leading to thecharge forming device under pressure.

2. The combination with an internal com bustion engine having a chargeforming device provided with a bowl having a valve controlled inlet, amain fuel supply tank, of a pum in communication with said fuel tankhaving a weighted piston, said pump being provided with a valvecontrolled inlet and a valve controlled outlet, a pipe leading from theoutlet of said pump to the inlet of the fuel bowl of said charge formingdevice, the weight of said piston being adapted to exert pressure on thefluid in the pump cylinder thereof for maintaining the fuel in said pipeleading to the charge forming de vice under pressure and pneumatic meansfor intermittently raising said pump piston, said pneumatic means beingmechanically driven and timed by the engine.

3."The combination with an internal combustion engine having a chargeforming device provided with a fuel bowl having an inlet, a floatcontrolled valve controlling said inlet, a main fuel supply tank locatedin a plane below said charge forming device, of a fuel pump incommunication with said fuel tank and the fuel bowl of said chargeforming device, said ump having a valve controlled inlet and out et,said pump having a piston adapted to drop by gravity for exertingpressure on the fuel therein for maintaining the fuel in said fuelconduit extending from said pump to said charge forming device underpressure and an air pump mechanically driven by the engine forintermittently raising said piston.

4. The combination with an internal combustion engine having a chargeforming device and a main fuel supply located in a plane below the same,of a fuel pump in communication with said fuel tank and said chargeforming device, the inlet and outlet of said fuel pump being providedwith a check valve, an air cylinder having a piston connected to thepiston of said pump and an air pump driven by the engine for deliveringair intermittently to said air cylinder beneath said piston forintermittently raising said pump piston and allowing said pump piston todrop by gravity for forcing and maintaining fuel in the fuel lineleading to the charge forming device under pressure.

5. The combination with an internal combustion engine having a chargeforming device, of a supply tank for supplying fuel to said chargeforming device, a fuel pump within said tank, a pipe leading from saidfuel pump to said charge forming device, an air chamber having a pistonconnected to the piston of the fuel pump, an air pump mounted on saidinternal combustion. engine and driven thereby and a pipe leading fromsaid air pump to said air cylinder for delivering air intermittently tosaid air cylinder for raising said pump piston and allowingthe same todrop by gravity.

6. The combination with an internal combustion engine having a chargeforming device, of a fuel tank, a pump in communication. with said fueltank, a pipe leading from said pump to said charge forming device, saidpump having a weighted piston, an air cylinder disposed above said pumphaving a piston slidably mounted therein connected to the piston of thefuel pump, said piston being provided with a passage, an air pumpmounted in said internal combustion engine having a sliding piston, acam for moving said piston in one direction, means driven and timed bythe engine for operating said cam and an air pipe leading from said pumpto said air chamber whereby the pump piston will be intermittentlyraised and allowed to drop by gravity for forcing fuel from said fueltank to said charge forming device.

7. The combination with an internal combustion engine having a chargeforming device, of a fuel tank, a. fuel pump for forcing fuel from saidtank to said charge forming device, an air pump mounted in said enginehaving an air inlet in communication with the crank case thereof, anengine-driven cam for operating the piston of said air pump and meansoperated by said air pump for intermittently raising the piston of saidfuel pump and allowing the same to drop by gravity for forcing fuel fromsaid tank to said charge forming device.

8. The combination with an internal combustion engine having a chargeforming device provided with a fuel bowl and a valve controlled inlettherefor, of a pump having inlet and outlet check valves, a main fuelsupply tank, a fuel conduit extending from said tank to the inlet ofsaid pump, a fuel conduit extending from the outlet of said pump to theinlet of the bowl of the charge forming device, said pump having aweighted piston for forcing fuel to said charge forming device andmaintaining the same under pressure in the fuel conduit and pneumaticmeans mechanically driven by the engine for intermittently raising saidpump piston and allowing the same to drop by gravity.

In testimony whereof I hereunto afiix my signature.

ALBERT G. REDMOND.

